CN106425276B - The welding repair method of 4145H forging and its 4145H forging of reparation - Google Patents
The welding repair method of 4145H forging and its 4145H forging of reparation Download PDFInfo
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- CN106425276B CN106425276B CN201611094549.7A CN201611094549A CN106425276B CN 106425276 B CN106425276 B CN 106425276B CN 201611094549 A CN201611094549 A CN 201611094549A CN 106425276 B CN106425276 B CN 106425276B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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Abstract
The present invention provides a kind of welding repair method of 4145H forging and its 4145H forging of reparation, it is related to welded steel technical field, the welding repair method of 4145H forging provided by the invention includes: preparation before welding, welding, annealing and etc., by the present invention in that carrying out the special welding method of built-up welding with ontology welding wire, it solves and 4145H forging is welded using conventional repair method in the prior art, it is easy to produce stomata, cold crack, the problem of the defects of hardness is higher after slag inclusion and repair welding, 4145H forging after making welding has reached flawless, welding bead organization material and the consistent technical effect of ontology forging.
Description
Technical field
The present invention relates to welded steel technical fields, a kind of welding repair method more particularly, to 4145H forging and its
The 4145H forging of reparation.
Background technique
4145H also known as stone oil drill collar steel.4145H is wide due to its special performance as a kind of structural alloy steel
It is general to be applied to industrial equipment field, especially on petroleum equipment product.
Nowadays, the investment of energy bound pair oil-gas mining is increasing, and the exploration in especially deep-sea area and cold sea area is opened
The importance and strategic position of hair have been to be concerned by more and more people.Therefore, oil equipment is proposed with steel construction and equipment
More harsh service performance requirement, and these engineering steel show structure large-scale, the trend of intensity superelevation, this is to petroleum
Equipping steel construction, more stringent requirements are proposed and more acute challenge.
It, in use can be strong because of part since 4145H forging is widely used in the forging products of petroleum equipment
The damage phenomenons such as degree variation causes forging appearance to wear, collapses hole greatly, surface is cracked and hardness is uneven, so as to cause forging
Part is scrapped.Since 4145H forging price is higher, how to repair 4145H forging and prolongs its service life as oil exploitation
The key of industry reduction production cost.
For existing welding method since 4145H forging tendency of hardenability is big, base metals heat affected area is easy to produce low modeling
Property hardened structure, in annealing process, be easy to generate cold crack along the quenched zone of heat affected area.The origin of this cold crack is multiple
Life is with notch effect welding heat affected zone or the locally band for having the non-uniform hydrogen of physical chemistry to assemble, these crackles are sometimes
Postwelding occurs immediately, and sometimes through just occurring after a period of time, and the harmfulness of this delayed crack is even more serious.The prior art
In, 4145H forging is welded using conventional repair method, is easy to produce after stomata, cold crack, slag inclusion and repair welding firmly
Spend the defects of higher.
Therefore, research and discussion is carried out to the welding procedure technique of 4145H forging and engineering experience, provides one kind more
It is seemed very necessary for the welding technique of optimization.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first object of the present invention is to provide a kind of welding repair method of 4145H forging, and the method is by adopting
With ontology welding wire, built-up welding welding, annealing and etc. 4145H forging is welded, the forging of postwelding have be not likely to produce stomata,
The advantages that cold crack and slag inclusion, meanwhile, overcome after forging repair welding that hydrogen content is excessively high in weld seam, it is hard so as to cause forging after reparation
Spend higher defect.
The second object of the present invention is to provide a kind of 4145H forging of reparation, forging welding bead tissue after welding
Reached with the consistent effect of forging body tissue, extend 4145H forging service life be oil exploitation industry reduce
Production cost.
A kind of welding repair method of 4145H forging provided by the invention, includes the following steps:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, then whole preheating
Forging and dry welding rod；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, the forging after obtaining REPAIR WELDING.
Further, the above method still further comprises step (4) inspection after welding: being repaired using supersonic detector to welding
Forging after multiple carries out Metallographic Analysis detection, is detected with Brinell hardness tester to the forging hardness after REPAIR WELDING, for super
There is the forging of crackle after sonic analyzer detection, repeat the above steps (1)~(3).
Further, the U-shaped groove angle of step (1) is 10~20 °, groove bottom be it is arc-shaped, groove minimum clearance be 8
~12mm.
Further, the whole pre- hot forging of step (1) be 380~420 DEG C at a temperature of, forging integrally preheats to 3~
5h, pre-heating temperature elevation speed are 80 DEG C/h.
Further, the dry welding rod of step (1) be 350~400 DEG C at a temperature of, by the dry 2~3h of welding rod.
Further, the method for step (3) annealing are as follows: forging is placed in tempering furnace and is warming up to 600~650 DEG C, constant temperature
Anneal 3~5h, and annealing heating rate is 80 DEG C/h, and placement is taken out after cooling to 120~150 DEG C with the furnace and is cooled down in air, complete
At annealing.
Further, above-mentioned welding rod is J507 welding rod or 4145HMOD welding rod, and core diameter is 3~3.5mm.
Further, above-mentioned to be welded as carrying out built-up welding using pulsed argon arc welding.
Further, above-mentioned ontology welding wire is the welding wire processed in forging body, or is identical with forging body
The welding wire processed on other forging.
Further, the welding repair method of above-mentioned 4145H forging, includes the following steps
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, groove angle is 10
~20 °, groove bottom be it is arc-shaped, groove minimum clearance be 8~12mm；Then by forging 380~420 DEG C at a temperature of,
3~5h of whole preheating, pre-heating temperature elevation speed are 80 DEG C/h, and are the J507 welding rod or 4145HMOD welding rod of 3~3.5mm by diameter
Dry 2~3h at 350~400 DEG C；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, forging is placed in tempering furnace and is warming up to 600
~650 DEG C, heating rate is 80 DEG C/h, 3~5h of cycle annealing, takes out and is placed in air after cooling to 120~150 DEG C with the furnace
It is cooling, the forging after obtaining REPAIR WELDING；
(4), Metallographic Analysis inspection after welding: inspection after welding: is carried out to the forging after REPAIR WELDING using supersonic detector
Detection, detects the forging hardness after REPAIR WELDING with Brinell hardness tester, for having crackle after supersonic detector detection
Forging, repeating said steps (1)~(3).
A kind of 4145H forging of reparation provided by the invention, the forging use the REPAIR WELDING of above-mentioned 4145H forging
Method carries out REPAIR WELDING and obtains.
Compared with prior art, the invention has the benefit that
(1), the welding repair method of 4145H forging provided by the invention, by preparing before welding, being carried out with ontology welding wire
Built-up welding welds 4145H forging with annealing, the forging flawless after the method for the present invention is welded, welding bead tissue
Material is consistent with ontology forging, and the present invention uses aiming at the problem that constraint stress of forging in welding process causes to crack
The technology of built-up welding is tempered upper one layer of welding bead using next layer of welding bead.Meanwhile each layer of welding bead be soldered after subtracted using hammering
Low residual stress reduces distortion of lattice degree, to reduce to promote the carbon in weld seam in martensite to be precipitated with carbide form
The degree of hardening of heat affected area improves welding seam toughness, alleviates welding cold cracking tendency.4145H forging is overcome by the above method
The problem that part constraint stress deficiency causes cold crack serious, when solving using conventional soldering method to the welding of 4145H forging,
It is easy to produce the defects of hardness after stomata, cold crack, slag inclusion and forging repair welding is higher, and then extends making for 4145H forging
It is that oil exploitation industry reduces production cost with the service life.
In addition, the present invention selects the identical ontology welding wire of chemical component as welding material, decrease because material expands
The additional stress that coefficient is different and generates.
(2), the 4145H forging of reparation provided by the invention, the forging by above-mentioned 4145H forging welding repair method
It repairs and obtains, due to selecting the identical ontology welding wire of chemical component as welding material, welding bead tissue has reached and forging after welding
The consistent effect of this body tissue of part, as the workpiece tissue of not repair welding, the service life for extending 4145H forging is petroleum
Production industry reduces production cost.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1: ultrasonic wave Metallographic Analysis is carried out for the forging of the invention for implementing 3 pairs of J507 welding rods welding, 100 times of amplification is shown
Micro- photo, wherein
Part A is forging matrix, and Metallographic Analysis is sorbite and bainite；
Part B is J507 welding rod weld seam, and Metallographic Analysis is that ferritic-pearlitic adds a small amount of sorbite.
Fig. 2: the forging for implementing 4 pairs of 4145HMOD welding rod welding for the present invention carries out ultrasonic wave Metallographic Analysis, amplifies 100 times
Microphoto, wherein
Part A is forging matrix, and Metallographic Analysis is sorbite and bainite；
Part B is 4145HMOD welding rod weld seam, and Metallographic Analysis is sorbite and bainite.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
According to an aspect of the present invention, a kind of welding repair method of 4145H forging, includes the following steps:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, then whole preheating
Forging and dry welding rod；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being annealed, the forging after obtaining REPAIR WELDING.
In above-mentioned preferred embodiment, above-mentioned steps (1) process the greasy dirt on global purge forging surface before U-shaped groove,
Iron rust, water stain and burr.
In the present invention, since the greasy dirt, iron rust and air humidity etc. on welding groove surface are all hydrogen-rich in weld metal
The main reason for, the present invention was welded by reducing as far as possible to the step of forging cracking or damaged part polishing back chipping before welding
The content of hydrogen in journey,
Stomata in the present invention, through the above steps in (2) weld deposit process after the completion of every layer of welding bead, first to welding bead generation
And the defects of crackle, thoroughly removes, and plays and improves next layer of welding bead to the tempering effect of upper one layer of weld seam.Then hammer into shape from top to bottom
Welding bead surface is hit, the hammering direction of adjacent two interpass is wanted on the contrary, can reduce the residual stress between welding bead, in this way to promote to weld
Carbon in seam in martensite is precipitated with carbide form, reduces distortion of lattice degree, so that the degree of hardening of heat affected area is reduced,
Improve welding seam toughness, alleviates welding cold cracking tendency.
In above-mentioned preferred embodiment, the defects of stomata and crackle that above-mentioned steps (2) generate welding bead, is thoroughly removed
Afterwards, in two layers of temper bead/ annealing bead of the more built-up welding in surface, to obtain tempering effect between better welding bead.
In the present invention, above-mentioned welding method by prepare before welding, carried out with ontology welding wire built-up welding and annealing and etc. pair
4145H forging is welded, the forging flawless after the method for the present invention is welded, welding bead organization material and ontology forging one
It causes, the tendency of hardenability for overcoming steel grade is strong, the diffusible hydrogen content in welding bead is higher and constraint stress is insufficient causes cold crack serious
The problem of, when solving using conventional soldering method to the welding of 4145H forging, be easy to produce stomata, cold crack, slag inclusion and
The defects of hardness is higher after forging repair welding, and then the service life for extending 4145H forging is that oil exploitation industry reduces life
Produce cost.
In the preferred embodiment of the present invention, the above method still further comprises step (4) inspection after welding: using
Supersonic detector carries out Metallographic Analysis detection to the forging after REPAIR WELDING, with Brinell hardness tester to the forging after REPAIR WELDING
Hardness is detected, for having the forging of crackle, repeating said steps (1)~(3) after supersonic detector detection.
In the preferred embodiment of the present invention, the above method, which is still further comprised, repairs welding with Brinell hardness tester
Forging hardness after multiple is detected, if the hardness standard of corresponding use environment is not achieved in the forging after welding, repeat described in
Step (1)~(3).
In the preferred embodiment of the present invention, the U-shaped groove angle of step (1) is 10~20 °, and groove bottom is circle
Arc, groove minimum clearance are 8~12mm.
In the present invention, since 4145H forging general thickness is thicker, so generally processing U-shaped groove with mach method
It is welded, because U-shaped groove welding groove spatial area is big, packing material is few, is suitable for the biggish weldment of thickness.
In the preferred embodiment of the present invention, the whole pre- hot forging of step (1) is the temperature at 380~420 DEG C
Under, forging is integrally preheated into 3~5h, pre-heating temperature elevation speed is 80 DEG C/h.
In the present invention, forging is slowed down into the cooling velocity of postwelding forging in 380~420 DEG C of the at a temperature of pre- thermal energy of entirety,
The evolution for being conducive to diffusible hydrogen in weld metal avoids the case where generating hydrogen induced cracking, and then also reduces weld dimensions
Degree of hardening.
In the preferred embodiment of the present invention, the dry welding rod of step (1) be 350~400 DEG C at a temperature of, will
Welding rod dries 2~3h.
In the present invention, welding rod is dried in (1) through the above steps, solves in annealing process forging physical chemistry not
The problem of locally band of uniform hydrogen aggregation is also easy to produce cold crack, it is higher to overcome moisture in electrode coating in the prior art,
In the welding process, due to the high temperature action of electric arc, hydrogen is decomposed into atom or ionic condition, and is largely dissolved in molten bath.?
During subsequent cooled and solidified, the diffusible hydrogen content in weld seam is higher, in the case where solubility drastically reduces, a part of hydrogen
Strongly overflow outward, and still some hydrogen remains in inside weld seam, and the hydrogen in weld seam is made to be in hypersaturated state, causes to weld
There is the problem of cold crack in position.
In the preferred embodiment of the present invention, the method annealed in step (3) are as follows: forging is placed in tempering furnace
600~650 DEG C, 3~5h of cycle annealing are warming up to, annealing heating rate is 80 DEG C/h, is taken after cooling to 120~150 DEG C with the furnace
It places and cools down in air out, complete annealing.
In the present invention, forging is heated to 600~650 DEG C, warm 3~5h, each spot temperature of forging can be made uniform,
And the residual stress of heap postwelding forging is made to be relaxed and be stablized, it is taken out after so cooling to 120~150 DEG C with the furnace and is placed on air
Middle cooling, and then reach the residual stress eliminated inside forging, and have the effect for reducing forging hardness concurrently.
In above-mentioned preferred embodiment, above-mentioned welding rod be J507 welding rod or 4145HMOD welding rod, core diameter be 3~
3.5mm。
The use of J507 is a kind of low hydorgew sodium type basic electrode in the present invention, with hydrogen content is few and tensile strength greatly
Advantage can reduce the oxygen content in weld seam in the present invention, reduce the formation of cold crack.
In the preferred embodiment of the present invention, above-mentioned to be welded as carrying out built-up welding using pulsed argon arc welding.
The present invention is using pulsed argon arc welding to 4145H forging repair welding, and small with pulse welding molten bath, heat affected area is small
Advantage belongs to a kind of welding method of small heat input multi-pass welding, solves since 4145H tendency of hardenability is big, phosphorus content compared with
Height, in the welding process, a part of base metals will be melted in weld metal, and layer carbon amount contained in the metals is caused to increase,
When leading to weld seam solidification and crystallization, crystallization temperature section is big, and also larger, the influence of sulfur-containing impurities and stomata in addition is inclined in segregation, holds
The problem of easily causing fire check in layer metal.
It is above-mentioned to carry out built-up welding using pulsed argon arc welding in above-mentioned preferred embodiment, electricity when argon arc-welding built-up welding welds
Pressure be 380V, electric current 170-180A, speed of welding 250-300mm/ minutes.
In the preferred embodiment of the present invention, above-mentioned ontology welding wire is the welding wire processed in forging body, or
Person is the welding wire processed on the same forging of chemical component.
In the present invention, selects the identical ontology welding wire of chemical component as welding material, reduce because of the material coefficient of expansion
Different and generation additional stress, welding bead tissue has reached and the consistent effect of forging body tissue after welding.
In the preferred embodiment of the present invention, the welding repair method of above-mentioned 4145H forging, including walk as follows
It is rapid:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, groove angle is 10
~20 °, groove bottom be it is arc-shaped, groove minimum clearance be 8~12mm；Then by forging 380~420 DEG C at a temperature of,
3~5h of whole preheating, pre-heating temperature elevation speed are 80 DEG C/h, and are the J507 welding rod or 4145HMOD welding rod of 3~3.5mm by diameter
Dry 2~3h at 350~400 DEG C；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being annealed, forging is placed in tempering furnace and is warming up to 600~650
DEG C, heating rate is 80 DEG C/h, 3~5h of cycle annealing, placement taken out after cooling to 120~150 DEG C with the furnace to be cooled down in air,
Forging after obtaining REPAIR WELDING.
(4), inspection after welding: Metallographic Analysis detection is carried out to the forging after REPAIR WELDING using supersonic detector, uses cloth
Family name's hardness tester detects the forging hardness after REPAIR WELDING, for having the forging of crackle, weight after supersonic detector detection
Multiple step (1)~(3).
Preferably,
The welding repair method of above-mentioned 4145H forging, includes the following steps:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping, stringent greasy dirt, the iron for removing workpiece surface
Rust, water stain and burr, and process U-shaped groove, and groove angle is 15 °, groove bottom be it is arc-shaped, groove minimum clearance is 8~
12mm；
Then by forging 400 DEG C at a temperature of, whole to preheat 4h, pre-heating temperature elevation speed is 80 DEG C/h, and is by diameter
The J507 welding rod or 4145HMOD welding rod of 3.2mm dry 2h at 380 DEG C；
(2), it welds: built-up welding, heap being carried out with pulsed argon arc welding to forging with the welding rod of ontology welding wire and step (1) after dry
During weldering after the completion of every layer of welding bead, the stomata and crackle of welding bead generation are purged first, then from top to bottom with flat
The vertical hammering welding bead surface of hammer, the hammering direction of adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, forging is placed in tempering furnace and is warming up to 620
DEG C, heating rate is 80 DEG C/h, cycle annealing 4h, and placement is taken out after cooling to 150 DEG C with the furnace and is cooled down in air, is welded
Forging after reparation.
(4), inspection after welding: Metallographic Analysis detection is carried out to the forging after REPAIR WELDING using supersonic detector, uses cloth
Family name's hardness tester detects the forging hardness after REPAIR WELDING, for having the forging of crackle, weight after supersonic detector detection
Multiple step (1)~(3).
According to an aspect of the present invention, the 4145H forging of a kind of reparation, the forging use above-mentioned 4145H forging
Welding repair method carries out REPAIR WELDING and obtains, and the forging is due to selecting the identical ontology welding wire of chemical component as welding material
Material, welding bead tissue has reached after welding extends as the workpiece tissue of not repair welding with the consistent effect of forging body tissue
The service life of 4145H forging is that oil exploitation industry reduces production cost.
Embodiment 1
A kind of welding repair method of 4145H forging, mainly includes the following steps:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, groove angle is
10 °, groove bottom be it is arc-shaped, groove minimum clearance be 8mm；Then by forging 380 DEG C at a temperature of, it is whole to preheat 3h,
Pre-heating temperature elevation speed is 80 DEG C/h, and the J507 welding rod that diameter is 3mm is dried 2h at 350 DEG C；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, forging is placed in tempering furnace and is warming up to 600
DEG C, heating rate is 80 DEG C/h, cycle annealing 3h, and placement is taken out after cooling to 120 DEG C with the furnace and is cooled down in air, is welded
Forging after reparation.
(4), inspection after welding: Metallographic Analysis detection is carried out to forging after welding using supersonic detector, uses Brinell hardness
Instrument detects forging hardness after welding.
Embodiment 2
A kind of welding repair method of 4145H forging, mainly includes the following steps:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, groove angle is
20 °, groove bottom be it is arc-shaped, groove minimum clearance be 12mm；Then by forging 420 DEG C at a temperature of, it is whole to preheat 5h,
Pre-heating temperature elevation speed is 80 DEG C/h, and the J507 welding rod that diameter is 3.5mm is dried 3h at 400 DEG C；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, forging is placed in tempering furnace and is warming up to 650
DEG C, heating rate is 80 DEG C/h, cycle annealing 5h, and placement is taken out after cooling to 150 DEG C with the furnace and is cooled down in air, is welded
Forging after reparation.
(4), inspection after welding: Metallographic Analysis detection is carried out to forging after welding using supersonic detector, uses Brinell hardness
Instrument detects forging hardness after welding.
Embodiment 3
A kind of welding repair method of 4145H forging, mainly includes the following steps:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, groove angle is
15 °, groove bottom be it is arc-shaped, groove minimum clearance be 10mm；Then by forging 400 DEG C at a temperature of, it is whole to preheat 4h,
Pre-heating temperature elevation speed is 80 DEG C/h, and the J507 welding rod that diameter is 3.2mm is dried 2h at 380 DEG C；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, forging is placed in tempering furnace and is warming up to 620
DEG C, heating rate is 80 DEG C/h, cycle annealing 4h, and placement is taken out after cooling to 150 DEG C with the furnace and is cooled down in air, is welded
Forging after reparation.
(4), inspection after welding: Metallographic Analysis (see Fig. 1) is carried out using supersonic detector to the forging being welded, forging base
Body is sorbite and bainite, and weld seam is that ferritic-pearlitic adds a small amount of sorbite；Hardness is detected with Brinell hardness tester,
Forging hardness HB337,507 bead hardness HB167.
Embodiment 4
The welding repair method of above-mentioned 4145H forging, mainly includes the following steps:
(1), prepare before welding: to forging cracking or damaged part polishing back chipping and processing U-shaped groove, groove angle is
15 °, groove bottom be it is arc-shaped, groove minimum clearance be 10mm；Then by forging 400 DEG C at a temperature of, it is whole to preheat 4h,
Pre-heating temperature elevation speed is 80 DEG C/h, and the J507 welding rod that diameter is 3.2mm is dried 2h at 380 DEG C；
(2), weld: welding rod after being dried with ontology welding wire and step (1) carries out built-up welding to forging, every layer in weld deposit process
After the completion of welding bead, the stomata and crackle of welding bead generation are purged first, then vertically hammer weldering with plane bottom hammer from top to bottom
The hammering direction on road surface, adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, forging is placed in tempering furnace and is warming up to 620
DEG C, heating rate is 80 DEG C/h, cycle annealing 4h, and placement is taken out after cooling to 150 DEG C with the furnace and is cooled down in air, is welded
Forging after reparation.
(4), inspection after welding: Metallographic Analysis (see Fig. 2) is carried out using supersonic detector to the forging being welded, forging base
Body is sorbite and bainite, and weld seam is sorbite and bainite；Hardness is detected with Brinell hardness tester, forging hardness
HB337,4145HMOD bead hardness HB339.
Technical effect of the invention be by prepare before welding, carried out with ontology welding wire built-up welding and annealing and etc. pair
4145H forging is welded, and the 4145H forging after making welding has reached flawless, and welding bead organization material is consistent with ontology forging
Technical effect.
The present invention is by overcoming existing welding technique since the steel grade tendency of hardenability of 4145H forging is strong, the expansion in welding bead
The problem of scattered hydrogen content is higher and constraint stress insufficient this three aspect and then reach said effect, specifically:
Big for 4145H tendency of hardenability, phosphorus content is higher, and in the welding process, a part of base metals will melt
Into weld metal, layer carbon amount contained in the metals is caused to increase, when leading to weld seam solidification and crystallization, crystallization temperature section is big, segregation
Tendency is also larger, and the influence of sulfur-containing impurities and stomata in addition is easy the problem of causing fire check in layer metal.The present invention adopts
With built-up welding, especially with pulsed argon arc welding to 4145H forging repair welding, small with pulse welding molten bath, heat affected area is small
Advantage.Meanwhile the present invention selects the identical ontology welding wire of chemical component as welding material, decreases because of the material coefficient of expansion
Different and generation additional stress, and then solve the problems, such as this.
Aiming at the problem that the locally band of the non-uniform hydrogen aggregation of forging physical chemistry in annealing process is also easy to produce cold crack,
It since hydrogen amount is few in 4145H forging and ontology welding wire, almost can be ignored, so the moisture in welding rod material, welding
The main reason for greasy dirt, iron rust and the air humidity etc. of groove face are all hydrogen-rich in weld metal.The present invention passes through drying
Welding rod and the content for reducing hydrogen in welding process as far as possible to the step of forging cracking or damaged part polishing back chipping before welding,
And then the locally band for solving the problems, such as that forging hydrogen is assembled in annealing process is also easy to produce cold crack.
It is to lead to the problem of delayed crack constraint stress state in welding process, the present invention is to improve welding seam toughness,
Alleviate welding cold cracking tendency, upper one layer of welding bead is tempered using next layer of welding bead using the technology of built-up welding.Meanwhile it is each
Layer welding bead is dropped after being soldered using hammering reduction residual stress with promoting the carbon in weld seam in martensite to be precipitated with carbide form
Low distortion of lattice degree to reduce the degree of hardening of heat affected area, and then solves constraint stress state and generates delayed crack
The problem of.
The present invention is overcome and is welded using conventional repair method to 4145H forging by the improvement of above-mentioned three aspect
It connects, the defects of hardness after stomata, cold crack, slag inclusion and repair welding is higher is easy to produce, to reach the 4145H forging after welding
Flawless, welding bead organization material and the consistent technical effect of ontology forging.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (1)
1. a kind of welding repair method of 4145H forging, which comprises the steps of:
(1), prepare before welding: polishing back chipping to forging cracking or damaged part, the stringent greasy dirt for removing workpiece surface, iron rust,
Water stain and burr, and process U-shaped groove, groove angle is 15 °, groove bottom be it is arc-shaped, groove minimum clearance is 8~
12mm；
Then by forging 400 DEG C at a temperature of, whole to preheat 4h, pre-heating temperature elevation speed is 80 DEG C/h, and is 3.2mm by diameter
J507 welding rod or 4145HMOD the welding rod dry 2h at 380 DEG C；
(2), it welds: built-up welding, built-up welding being carried out with pulsed argon arc welding to forging with the welding rod of ontology welding wire and step (1) after dry
In journey after the completion of every layer of welding bead, the stomata and crackle of welding bead generation are purged first, then hung down from top to bottom with plane bottom hammer
Plumb hits welding bead surface, and the hammering direction of adjacent two interpass is wanted on the contrary, then welding is completed in layer-by-layer built-up welding；
(3), it anneals: after the completion of welding, forging being subjected to stress relief annealing, forging is placed in tempering furnace and is warming up to 620 DEG C, rise
Warm speed is 80 DEG C/h, cycle annealing 4h, and placement is taken out after cooling to 150 DEG C with the furnace and is cooled down in air, REPAIR WELDING is obtained
Forging afterwards；
(4), inspection after welding: carrying out Metallographic Analysis detection to the forging after REPAIR WELDING using supersonic detector, hard with Bu Shi
Degree instrument detects the forging hardness after REPAIR WELDING, for there is the forging of crackle after supersonic detector detection, repeats institute
State step (1)~(3).
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| CN109079420A (en) * | 2018-09-14 | 2018-12-25 | 安徽马钢重型机械制造有限公司 | A kind of casting defect removing method |
| CN109079421B (en) * | 2018-10-30 | 2019-09-24 | 西南交通大学 | A kind of method that locomotive buffer bar surface reconditioning remanufactures |
| CN109280788B (en) * | 2018-11-28 | 2020-12-01 | 陕西宝锐金属有限公司 | Process for preventing weld joint stress corrosion cracking of GH625 alloy pipe |
| CN109623095B (en) * | 2019-01-30 | 2021-02-02 | 烟台蓝鲸增材有限公司 | Isothermal welding bead method for high-hardness material repair welding |
| CN109967974B (en) * | 2019-02-26 | 2021-11-26 | 安徽森钢建筑工程有限公司 | Method for reducing welding stress of steel structure product |
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